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<http://schema.org/description>
"● Tubes: made of strong, highly transparent medical grade polypropylene ● Plug-seal screw on caps: made of medical grade polypropylene ● Large white writing area for easy marking ● Double threaded design reduces cross-threading; caps are easily opened and closed ● Gamma radiation sterilized, non-pyrogenic ● Available in bulk package (sterile & non-sterile) ● RNase & DNase free Specifications ● ..."
<https://biologixusa.com/Biologix-Centrifuge-Tubes-Plug-Seal-50mL-Sterile-Bulk-Case-of-500-p290828072>